专为65岁以上老年人设计的BMI计算API，使用标准公式BMI=体重(kg)/身高²(m²)，支持公制/英制单位转换，采用老年BMI分类标准：<23为偏瘦，23-29.9为正常，≥30为超重/肥胖，提供精准健康评估。
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